I found the below video from YouTuber Espresso where he talks about the changes coming to the Prestige system and the Battle Pass in Call of Duty: Modern Warfare II compared to how they worked in past games, which I suggest you check out. Below is also a few quotes from Call of Duty's recent blog post about the new battle pass and the new prestige system coming in MW II:
About the new Battle Pass
Instead of a linear stream of tiers set out in a scrolling row along the bottom of your screen, your Battle Pass takes the form of a multi-Sector map. Players will unlock items using earned Battle Token Tier Skips across this map, which is themed within the current season. Each map has at least 20 Sectors with five items in each Sector - tokens can be used to either unlock adjacent Sectors or earn more items within an unlocked Sector.
Source: callofduty.com
About the new Prestige system
This year, leveling up past Rank 55 will allow you to earn a persistent Prestige Rank across all seasons, rather than having it reset at the end of each season. ... At the end of Season 01, players can continue ranking up from wherever they ended up on the Prestige Ranks.
Source: callofduty.com
How Modern Warfare 2 Is Changing PRESTIGE & The Battle Pass System Explained
Video by YouTuber Espresso.